US4738682A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Clarification agent for colored cellulose fabrics and method for treatment of such fabrics
Assignee: Novozymes AS
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Filing: 1986-10-02
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Granted: 1988-04-19
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Expires: 2006-10-02
Abstract
Abstract Treatment of colored cellulose fiber fabrics for at least fifteen minutes with an aqueous solution of cellulase containing at least about 250 CMC units per liter under pH conditions conducive to high activity for the cellulase clarifies the color.
Inventors
- 👤 Kirsten Boegh
- 👤 Soren J. Jepsen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 03:54
CPC Classifications
C; C11; C11D; C11D3/00; C11D3/16; C11D3/38; C11D3/386; C11D3/38645; D; D06; D06M; D06M16/00; D06M16/003
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
48 words
A color clarification method which comprises treating clean colored but faded cellulose fiber fabrics with an aqueous solution of cellulase for at least fifteen minutes, the cellulase concentration exceeding 250 CMC units per liter and the pH being at a level conducive to high activity for the cellulase.
Claim 2
Dependent Claim
48 words
A color clarification method which comprises treating clean colored but faded cellulose fiber fabrics with an aqueous solution of cellulase for at least fifteen minutes, the cellulase concentration exceeding 250 CMC units per liter and the pH being at a level conducive to high activity for the cellulase.
Claim 3
Dependent Claim
16 words
The method of claim 1 further comprising treating at about the pH optimum of the cellulase.
Claim 4
Dependent Claim
21 words
The method of claim 1 further comprising treating at a solution temperature in the range of 40°-75° C. for 15-90 minutes.
Claim 5
Dependent Claim
12 words
The method of claim 1 wherein the cellulase is Humicola insolens cellulase.
Claim 6
Dependent Claim
12 words
The method of claim 1 wherein the cellulase is Sporotrichum pulverulentum cellulase.
Claim 7
Dependent Claim
12 words
The method of claim 1 wherein the cellulase is Fusarium oxysporum cellulase.
Claim 8
Dependent Claim
12 words
The method of claim 1 wherein the cellulase is Trichoderma reesei cellulase.
References Cited (Backward Citations)
GB1368599A
Cited
US4155868A
Cited
US4435307A
Cited
US4443355A
Cited
US4597886A
Cited
US4661289A
Cited
US4610800A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-04-19 | 1991-10-19 | 1992-04-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-04-19 | 1995-10-19 | 1996-04-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-04-19 | 1999-10-19 | 2000-04-19 | $7700.00 | Window Closed / Lapsed |